Forged from high-silicon aluminum alloy for maximum strength and dependability. Dedicated forgings used for superior strength to weight ratio utilizing aerospace alloy. ArmorGlide skirt coating provides reduced friction, quieter operation, improved scuff resistance. All Wiseco High-Performance Motorcycle Pistons come with rings and circlips. Fits: Arctic Cat ATV 550 Limited, Core, TRV, Prowler XT, Cruiser, GT Models 2009-13.